Do you ever hear a ticking or knocking when it reads 0 oil pressure? If not, replace the oil sending unit. It is a cheap part and easy to replace. Chances are the old one is going bad.
As far as sludge, just keep the oil changed every 3K miles. The engine in your truck should easily go over 200K if you maintain it.
Let me know if you have other questions.
Joe
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Monday, December 14th, 2009 AT 10:44 AM